23 septembre 2013

Le Groupe AGRICA migre ses répartiteurs de charge HAProxy vers un cluster ALOHA Load Balancer

Communiqué de presse Virtualisé à 99,9 %, le système d’information du Groupe AGRICA s’appuyait jusque-là sur des load balancers open source HAProxy unitaires. Afin d’en industrialiser le déploiement et l’exploitation, la DSI du Groupe AGRICA a fait le choix de basculer vers les load balancers ALOHA d’Exceliance, bâtis sur un socle HAProxy, en cluster.   Jouy-en-Josas, le 11 septembre 2013 – Exceliance, éditeur français de solutions de répartition de charge et de haute disponibilité, annonce que le Groupe AGRICA a migré une... [Lire la suite]
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01 juillet 2011

Applications critiques: Symantec rapproche ApplicationHA de VMware

Désormais intégrée à VMware vCenter Site Recovery Manager, la nouvelle version d'ApplicationHA veut accélérer la reprise d'activités après inciden Symantec vient de renforcer ApplicationHA, sa solution de virtualisation des applications critiques en assurant leur haute disponibilité (High Availability) pour les environnements virtuels VMware . La nouvelle version s’intègre désormais à VMware vCenter Site Recovery Manager. Ce qui visera à faciliter, voire accélérer, la reprise des activités après incident. Dans ce cadre,... [Lire la suite]
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05 novembre 2010

How does Symantec ApplicationHA integrate/work with VMware HA?

I briefly touched on this topic already, but I guess on Yellow-Bricks the primary focus should be technical. I downloaded Symantec’s Application HA and decided to give it a spin, I already started documenting the installation of the ApplicationHA Console and the Guest Component but Mr Sloof beat me to it and documented his finding in the following two articles. ApplicationHA – Install and Configure The ApplicationHA Configuration Wizard – Monitoring SQL Server 2008 No need to repeat it in my opinion as Eric did an excellent... [Lire la suite]
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26 octobre 2010

HA, the missing link…

One of the things that has always been missing from VMware’s High Availability solution stack is application awareness. As I explained in one of my earlier posts this is something that VMware is actively working on. Instead of creating a full App clustering level VMware decided to extend “VM Monitoring” and created an API to enable App level resiliency. At VMworld I briefly sat down with Tom Stephens who is part of the Technical Marketing Team as an expert on HA and of course the recently introduced App Monitoring. Tom explained me... [Lire la suite]
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26 octobre 2010

Did you know? All hosts failed…

Today I received a very valid question around a full cluster failure. What happens when all the hosts in a cluster go down and at some point return? Will the VMs be restarted and what do I need to have in place to ensure they will? It seems to be an urban myth that you need to use “auto-start” for a full cluster failure. But as you might have noticed that won’t work when HA is enabled. So what will? VMware HA Is it really that simple? Yes it is! When a full cluster fails and nodes start powering up HA will restart the VMs. As... [Lire la suite]
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16 octobre 2010

New HA Design Guidance Articles

Last week we updated our Exchange TechNet articles.  Within that update are two new articles that I wanted to call out: Understanding High Availability Factors - This article summarizes my US TechEd 2010 Exchange 2010 High Availability Design Considerations breakout session by discussing several design decision points you must make when architecting an Exchange 2010 High Availability and/or Site Resilient design. Database Copy Layout Design - A month ago we released a blog article on how to design a symmetrical database... [Lire la suite]
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30 mars 2010

Cool new HA feature coming up to prevent a split brain situation!

I already knew this was coming up but wasn’t allowed to talk about it. As it is out in the open on the VMTN community I guess I can talk about it as well. One of the most common issues experienced with VMware HA is a split brain situation. Although currently undocumented, vSphere has a detection mechanism for these situations. Even more important the upcoming release ESX 4.0 Update 2 will also automatically prevent it! First let me explain what a split brain scenario is, lets start with describing the situation which is most... [Lire la suite]
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25 mai 2009

vSphere HA Isolation Response

As of VMware vCenter 2.5 Update 2 the HA default isolation response changed from “Power Off” to “Leave powered on”. A lot of people liked this new default setting because it would lower the chances of downtime due to a “false positive”. I’ve never been a fan though, I just don’t like using degraded hardware or a degraded ESX host for that matter. Those that did like the change should take notice of the fact that with vSphere comes a new default isolation response: Note that this change is only for new clusters, if you... [Lire la suite]
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19 mai 2009

Will VMware give away VMotion and HA for free?

The virtualization wars heated up again last week when Microsoft announced that the next release of Hyper-V will include Live Migration, its version of VMotion, and High Availability (HA) features for free. Currently, these features are not included for free in VMware’s free edition of ESXi; VMotion is only available in the Advanced and Enterprise versions of vSphere; and HA is included in all but the free and the low-end Essentials edition. This just serves as further proof that Microsoft is desperate to catch up with VMware and win... [Lire la suite]
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06 mai 2009

Microsoft Hyper-V Server 2008 R2 Release Candidate! (Free Live Migration/HA Anyone?)

Virtualization Nation, The Virtualization team is pleased to announce the availability of the Microsoft Hyper-V Server 2008 R2 Release Candidate for download. Hyper-V Server 2008 R2, our free standalone hypervisor, represents our continued commitment to providing high performance, hypervisor based virtualization for everyone, especially small and mid-market customers. This release underscores our customer focus by adding key new capabilities such as Live Migration and High Availability (and more.). The Microsoft Hyper-V Server 2008... [Lire la suite]
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